/*
 * Copyright 2017-2019 The OpenTracing Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package io.opentracing.contrib.grpc;

import static org.junit.Assert.assertNotNull;

import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.ForwardingClientCallListener;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.opentracing.mock.MockTracer;
import javax.annotation.Nullable;

public class SecondClientInterceptor implements ClientInterceptor {

  private final MockTracer tracer;

  SecondClientInterceptor(MockTracer tracer) {
    this.tracer = tracer;
  }

  @Override
  public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
      MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) {

    assertNotNull(tracer.activeSpan());

    return new ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(
        next.newCall(method, callOptions)) {

      @Override
      public void start(Listener<RespT> responseListener, Metadata headers) {
        assertNotNull(tracer.activeSpan());
        super.start(
            new ForwardingClientCallListener.SimpleForwardingClientCallListener<RespT>(
                responseListener) {},
            headers);
      }

      @Override
      public void sendMessage(ReqT message) {
        assertNotNull(tracer.activeSpan());
        super.sendMessage(message);
      }

      @Override
      public void halfClose() {
        assertNotNull(tracer.activeSpan());
        super.halfClose();
      }

      @Override
      public void cancel(@Nullable String message, @Nullable Throwable cause) {
        assertNotNull(tracer.activeSpan());
        super.cancel(message, cause);
      }
    };
  }
}
